Siri App Suggestions

My question is specifically referring to if that algorithm can ever be wrong or error out.

Of course any algorithm designed by humans can be wrong. I believe, though, that location is also used to determine if the app is suggested so, it seems possible that an app could have been used the last time you were in a certain area but not since and that app could still be suggested.

Perhaps if you explained why you're asking someone could give you more useful answers.

1. Open the “Settings” app in iOS, then choose “Battery”
2. Scroll down to the “Battery Usage” section of settings and then tap on the little clock icon.
3. Under the app name in question, see exactly how much time an individual app has been used.